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Period: 2500 BCE to 2500 BCE
Prehistoric age
Papyrus /pəˈpaɪrəs/ is a material similar to thick paper that was used in ancient times as writing surface. It was made from the pith of the papyrus plant, Cyperus papyrus, a wetland sedge.[1] Papyrus (plural: papyri) can also refer to a document written on sheets of such material, joined together side by side and rolled up into a scroll, an early form of a book. -
Period: to
Industrial Age
he first typewriter to be commercially successful was invented in 1868 by Americans Christopher Latham Sholes, Frank Haven Hall, Carlos Glidden and Samuel W. Soule in Milwaukee, Wisconsin, although Sholes soon disowned the machine and refused to use, or even to recommend it. -
Period: to
Electronic Age
Electronic television was first successfully demonstrated in San Francisco on Sept. 7, 1927. The system was designed by Philo Taylor Farnsworth, a 21-year-old inventor who had lived in a house without electricity until he was 14. -
Period: to
Information age
A social network is a social structure made up of a set of social actors (such as individuals or organizations), sets of dyadic ties, and other social interactions between actors. The social network perspective provides a set of methods for analyzing the structure of whole social entities as well as a variety of theories explaining the patterns observed in these structures. .